136 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



The influence of the treatments on the places of entrance of fruit 

 by the larvae of the first and second broods combined for the respective 

 plats is shown in Table XVI. 



Table XVI. 



-Places of entrance of fruit by total larvsefor each tree of each plat. 

 Jackson, Va., 1909. 



Mount 



PLAT XIII. DEMONSTRATION. 





Total number of larvae of fruit for each tree, first 

 and second broods combined. 



Total 

 for 



plats. 



Percent- 

 ages of 

 larvae 

 entering 

 at calyx, 

 side, and 

 stem. 



Total 



Place of entrance. 



Tree 

 1. 



Tree 

 2. 



Tree 

 3. 



Tree 

 4. 



Tree 

 5. 



Tree 

 6. 



Tree 



7. 



Tree 



8. 



ber of 

 larvae. 



First and second broods: 

 Calyx 



32 



154 



14 



14 

 111 

 11 



15 

 122 



18 



16 



58 



9 



20 



136 



17 



26 

 125 



17 



15 

 92 

 12 



24 

 116 

 10 



162 

 914 

 108 



13.68 

 77.20 

 9.12 





Side 





Stem 









Total 



200 



136 



155 



83 



173 



168 



119 



150 



1,184 



100.00 



1,184 





PLAT XV. ONE SPRAY. 



First and second broods: 



Calyx 



Side 



Stem... 



13 



190 

 47 



32 

 193 



28 



Total 250 253 



16 



143 



27 



25 

 173 

 52 



19 

 183 

 17 



250 219 122 257 1,623 



17 



214 



26 



146 



1,261 

 216 



8.99 

 77.70 

 13.31 



100.00 



1,623 



PLAT XVII. UNSPRAYED. 



First and second broods : 



Calyx 



Side 



Stem 



Total. 



332 

 115 



1,913 



1,063 



265 119 



97 47 



1,425 865 



762 

 141 



1,232 

 203 

 103 



1,377 

 295 

 120 



1,538 1,792 



1,584 



353 



90 



209 

 69 



9,152 



1,917 



721 



11,790 



77.62 

 16.26 

 6.12 



100. 00 



11,790 



For more ready comparison of the efficiency of the treatments, 

 Table XVII is given, from which it will be seen that the demonstra- 

 tion and the one-spray treatments were about equally effective in 

 protecting the^alyx and that neither was satisfactory in controlling 

 worms entering the side. The difference in total efficiency between 

 the demonstration and the one-spray plats is quite small, namely, 

 1.06 per cent in favor of the former. The unsprayed trees show 46 

 per cent of wormy fruit, so there is a total saving of 38.44 per cent 

 of the crop by the demonstration treatment and 37.68 per cent by 

 the one-spray. 



Table XVII. — Efficiency of the one-spray and demonstration treatments as shown by 

 the percentages of wormy apples. Mount Jackson, Va., 1909. 



Plat No. 



Percentage of wormy apples. 



Total 

 number 

 of wormy 

 apples. 



Calyx. 



Side. 



Stem. 



Total. 



P.ct. 

 0.99 

 .75 

 35.71 



P.ct. 

 5.61 

 6.46 



7.48 



P.ct. 

 0.66 

 1.11 

 2.81 



P.ct. 

 7.26 

 8.32 

 46.00 



1,184 



1.623 



11,790 



Total 

 number 

 of apples. 



XIII (demonstration) 



XV (one-spray) 



XVII (unsprayed)... 



16,292 

 19. 502 

 25,630 



